islamic extremist group has claimed responsibility for the benghazi attack. officials fear there could be more violence. tahman bradley, abc news, washington. >> thanks to tahman bradley for that report. again, two state department officials have been killed in libya. we have a team of reporters in the region. for the very latest updates, coming up on "good morning america." >>> that violence has been condemned by presidential campaigns. and now, with 55 days to go, mitt romney is coming under heavy criticism, not from democrats but from members of his own party. it comes after the latest polls show president obama opening up a slight lead. here's abc's david muir. >> reporter: mitt romney in nevada on the anniversary of 9/11, in front of the national guard. >> we must keep our promises and regain the trust of all those who have worn the uniform and served our country. >> reporter: his speech comes after criticism that romney left afghanistan out of his convention speech. his loudest critics might be within his own party, after the poll numbers showing the pr